Pith Number

pith:Y4OWQ3TN

pith:2022:Y4OWQ3TN3KJIRMKHPITSWHNNFS

not attested not anchored not stored refs pending

Active Surrogate Estimators: An Active Learning Approach to Label-Efficient Model Evaluation

Jannik Kossen, Sebastian Farquhar, Tom Rainforth, Yarin Gal

arxiv:2202.06881 v2 · 2022-02-14 · cs.LG · stat.ML

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{Y4OWQ3TN3KJIRMKHPITSWHNNFS}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-05T05:08:03.402656Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c71d686e6dda9288b1477a272b1dad2c845e1850e77b772081630a1c384e5637

Aliases

arxiv: 2202.06881 · arxiv_version: 2202.06881v2 · doi: 10.48550/arxiv.2202.06881 · pith_short_12: Y4OWQ3TN3KJI · pith_short_16: Y4OWQ3TN3KJIRMKH · pith_short_8: Y4OWQ3TN

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/Y4OWQ3TN3KJIRMKHPITSWHNNFS \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c71d686e6dda9288b1477a272b1dad2c845e1850e77b772081630a1c384e5637

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "f87f2cbc7e28c7ca825dffd0124531ee2c9f5f3b74d6deeb115bae0edd93e450",
    "cross_cats_sorted": [
      "stat.ML"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.LG",
    "submitted_at": "2022-02-14T17:15:18Z",
    "title_canon_sha256": "dc5fb10fb1e5e696850a54bbb2ca9e7c153130510fa3461c2e40ae3bf0e767ff"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2202.06881",
    "kind": "arxiv",
    "version": 2
  }
}